By Kichiji Hatanaka, Hideyuki Sakai, K Sagara

This quantity includes the lawsuits of the 3rd assembly within the sequence of symposia and workshops on nuclear medium results. the themes lined contain many-body forces in few-nucleon structures, nuclear interactions within the medium, medium results in nuclear reactions, homes of the nuclear medium, and similar themes, with detailed emphasis on paintings regarding experimental information with intermediate-energy light-ion projectiles.

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Extra resources for Nuclear Many-Body and Medium Effects in Nuclear Interactions and Reactions: Proceedings of the Kyudai-Rcnp International Symposium

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It is concluded that the use of relativistic particle-holeand delta-holeexcitations for the pion selfenergy increases the critical density compared with the non-relativistic result, however still leads to condensation for densities from 2 t o 4 times normal nuclear matter density. *This work is supported by national science foundation of china. 34 1. Introduction Strong attractive force of pion is believed to bring about pion condensation at a high density. It is one of important problems to clarify the critical density of the pion condensation since it may affect high density systems such as heavy-ion collisions and the interior of neutron stars.

It is t o be noted that pion condensation by no means implies a naive Bose-Einstein condensation of pions, but the softening of the longitudinal spin-isospin mode with the critical momentum k,. On the other hand, such mode is unstable and the Lindhard function has an imaginary part before the critical density pc. We can see a peculiar enhancement of the strength function a t small energy near the critical density. The pion condensed phase can be represented in terms of chiral transformation as follows: Inc)= U(Bv(kc.

Lett. B489, 280 (2000). II. j p TOSHITAKA TATSUMI Department of Physics, Kyoto University, Kyoto, Japan LIANG-GANG LIU Department of Physics, Zhongshan University, Guangzhou, China HIROYUKI MATSUURA GRIPS, Tokyo 162-0056, Japan TAISUKE NAGASAWA Department of Physics, Kyushu University KEN-ICHI MAKIN0,NOBUO NODA,HIROAKI KOUNO AND AKIRA HASEGAWA Department of Physics, Saga University, Saga 840-8502, Japan The critical density of neutral pion condensation is investigated based on the relativistic framework and compared with nonrelativistic results.

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